WO2021260778A1 - Outil, et procédé de fabrication de celui-ci - Google Patents

Outil, et procédé de fabrication de celui-ci Download PDF

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Publication number
WO2021260778A1
WO2021260778A1 PCT/JP2020/024462 JP2020024462W WO2021260778A1 WO 2021260778 A1 WO2021260778 A1 WO 2021260778A1 JP 2020024462 W JP2020024462 W JP 2020024462W WO 2021260778 A1 WO2021260778 A1 WO 2021260778A1
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WIPO (PCT)
Prior art keywords
recess
tool
work
tool according
cutting
Prior art date
Application number
PCT/JP2020/024462
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English (en)
Japanese (ja)
Inventor
泰助 東
高志 原田
暁 久木野
直樹 渡部
真有香 背川
Original Assignee
住友電工ハードメタル株式会社
住友電気工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 住友電工ハードメタル株式会社, 住友電気工業株式会社 filed Critical 住友電工ハードメタル株式会社
Priority to PCT/JP2020/024462 priority Critical patent/WO2021260778A1/fr
Priority to JP2021555022A priority patent/JPWO2021260778A1/ja
Priority to TW110122547A priority patent/TW202206207A/zh
Publication of WO2021260778A1 publication Critical patent/WO2021260778A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/18—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing
    • B23B27/20—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing with diamond bits or cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft

Definitions

  • This disclosure relates to tools and tools manufacturing methods.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2017-119333 describes a ball end mill.
  • the ball end mill of Patent Document 1 has a main body portion and a blade portion.
  • the blade portion is attached to the tip of the main body portion.
  • the blade portion is formed of a diamond sintered body containing diamond particles and a binder.
  • the blade portion has a hemispherical shape.
  • the surface of the blade portion includes a concave portion and a convex portion.
  • the tool of the present disclosure includes a tip formed of binderless cubic boron nitride.
  • the tip has a surface that comes into contact with the work. At least a portion of the surface includes a plurality of first recesses and protrusions formed by the ends of two adjacent first recesses coming into contact with each other.
  • FIG. 1 is a side view of the ball end mill 100.
  • FIG. 2 is an enlarged view of region II of FIG.
  • FIG. 3 is a schematic plan view of the partial spherical surface 21a in the ball end mill 100.
  • FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG.
  • FIG. 5 is a process diagram showing a manufacturing method of the ball end mill 100.
  • FIG. 6 is an enlarged side view of the vicinity of the tip portion 20 of the ball end mill 200.
  • FIG. 7 is a schematic plan view of the partial spherical surface 21a in the ball end mill 200.
  • FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG.
  • FIG. 9 is a process diagram showing a manufacturing method of the ball end mill 200.
  • FIG. 1 is a side view of the ball end mill 100.
  • FIG. 2 is an enlarged view of region II of FIG.
  • FIG. 3 is a schematic plan view of the partial
  • FIG. 10 is a perspective view of the cutting insert 300.
  • FIG. 11 is a cross-sectional view of the tip portion 20 of the cutting insert 300.
  • FIG. 12 is a process diagram showing a method of manufacturing the cutting insert 300.
  • FIG. 13 is a side view of the radius end mill 400.
  • FIG. 14 is a side view of the stylus 500.
  • the present disclosure provides a tool having improved contact with a work (a machining tool or a cutting tool with improved machining accuracy of the workpiece, or a measuring tool with reduced contact resistance with the workpiece). ..
  • the tool according to one aspect of the present disclosure includes a tip portion formed of binderless cubic boron nitride.
  • the tip has a surface that comes into contact with the work. At least a portion of the surface includes a plurality of first recesses and protrusions formed by the ends of two adjacent first recesses coming into contact with each other. According to the tool according to one aspect of the present disclosure, the contact with the work can be improved.
  • the tool of (1) above may be a measuring tool for measuring the surface roughness or shape of the work. In this case, it is possible to reduce the contact resistance with the work when the tip portion is scanned along the surface of the work.
  • the tool of (1) above may be a machining tool for machining a work. In this case, it is possible to improve the processing accuracy when processing the work.
  • the surface may include a partial spherical surface.
  • the surface may include a groove and a cutting edge formed on the groove and the ridgeline of the partial spherical surface.
  • the tool of (1) above may be a cutting tool for cutting a work.
  • the surface may include a rake face, a flank, and a rake face and a cutting edge formed on the ridge of the flank. In this case, it is possible to improve the processing accuracy when processing the work.
  • the depth of the first recess may be 0.05 ⁇ m or more and 20 ⁇ m or less. In this case, it is possible to improve the processing accuracy when processing the work.
  • the arithmetic mean roughness of the surface of the first recess may be 0.05 ⁇ m or more and 1.5 ⁇ m or less. In this case, the durability of the tool can be improved.
  • the skewness parameter at the surface portion where the first recess and the protrusion are formed may exceed 0. In this case, the processing accuracy when processing the work can be further improved.
  • At least a part of the surface may include a second recess different from the first recess.
  • the depth of the second recess may be 1 ⁇ m or more. In this case, the durability of the tool can be improved.
  • the equivalent circle diameter of the second concave portion in a plan view may be 0.5 ⁇ m or more and 50 ⁇ m or less. In this case, the durability of the tool can be further improved.
  • the area ratio of the second recess on the surface may be 3% or more and 80% or less. In this case, the durability of the tool can be further improved.
  • the method for manufacturing a tool includes a step of preparing a tip portion formed of binderless cubic boron nitride and irradiating a laser to cover at least a part of the surface of the tip portion. , A step of forming a plurality of first recesses is provided. By contacting the ends of two adjacent first concave portions, a protruding portion is formed on a part of the surface of the tip portion.
  • a step of forming a rake face and a flank surface connected to the rake face may be further provided on the surface of the tip portion by irradiating the laser.
  • the tool according to the first embodiment is a cutting tool for cutting a work. More specifically, the tool according to the first embodiment is a ball end mill 100. This work is made of, for example, a steel material. This work may be made of a titanium alloy.
  • FIG. 1 is a side view of the ball end mill 100.
  • FIG. 2 is an enlarged view of region II of FIG.
  • the ball end mill 100 has a rotation axis A.
  • the ball end mill 100 processes the work by being rotated around the rotation axis A.
  • the ball end mill 100 has a main body portion 10 and a tip portion 20.
  • the main body 10 is formed of, for example, a cemented carbide.
  • the main body portion 10 has a first end 10a and a second end 10b in a direction along the rotation axis A.
  • the second end 10b is the opposite end of the first end 10a.
  • the main body 10 has a shank 11 and a neck 12.
  • the shank 11 is on the first end 10a side and the neck 12 is on the second end 10b side.
  • the shank 11 extends along the axis of rotation A.
  • the shank 11 has a first end 11a and a second end 11b in a direction along the rotation axis A.
  • the first end 11a coincides with the first end 10a.
  • the second end 11b is the opposite end of the first end 11a.
  • the shank 11 has a circular shape in a cross-sectional view orthogonal to the rotation axis A.
  • the neck 12 extends from the second end 11b along the axis of rotation A.
  • the neck 12 has a first end 12a and a second end 12b in a direction along the rotation axis A.
  • the first end 12a is the end on the shank 11 side.
  • the second end 12b is the opposite end of the first end 12a and coincides with the second end 10b.
  • the neck 12 has a circular shape in a cross-sectional view orthogonal to the rotation axis A.
  • the cross-sectional area of the neck 12 is smaller than the cross-sectional area of the shank 11 in the cross-sectional view orthogonal to the rotation axis A.
  • the tip portion 20 is attached to the main body portion 10 by, for example, brazing. More specifically, the tip portion 20 is attached to the second end 10b via the connection layer 13.
  • the connection layer 13 is a brazing material.
  • the tip portion 20 is formed of binderless cubic boron nitride.
  • the binderless cubic boron nitride contains a plurality of cubic boron nitride crystal grains.
  • the balance of the binderless cubic boron nitride may contain boron nitride having other crystal structures (wurtzite-type boron nitride, hexagonal boron nitride) and unavoidable impurities, but does not contain the binder. That is, in the binderless cubic boron nitride, each of the plurality of cubic boron nitride crystal grains is directly bonded to each other.
  • boron nitride (wurtzite-type boron nitride, hexagonal boron nitride) and unavoidable impurities having other crystal structures is preferable, but it may be contained in a few percent with respect to the total mass.
  • the average particle size of the cubic boron nitride crystal grains is less than 1 ⁇ m.
  • the average particle size of the cubic boron nitride crystal grains is preferably 10 nm or more and 500 nm or less.
  • the average particle size of the cubic boron nitride crystal grains may be 100 nm or more and 500 nm or less, or 100 nm or more and 300 nm or less.
  • the average grain size of cubic boron nitride crystal grains in binderless cubic boron nitride is determined by using an electron microscope such as JSM-7800F manufactured by JEOL Ltd. after precision polishing the surface of the tip portion 20. It can be measured by setting observation conditions for viewing the field, acquiring a backscattered electron microscope image, and performing image analysis.
  • the tip portion 20 has a surface 21.
  • the tip portion 20 has a hemispherical shape. That is, the surface 21 includes a partial spherical surface 21a.
  • the diameter of the hemisphere constituting the tip portion 20 is defined as the diameter R.
  • the surface 21 includes a groove 21b.
  • the surface 21 is recessed in the groove 21b.
  • the groove 21b extends radially from the vicinity of the central portion of the surface 21.
  • the ridgeline between the groove 21b and the partial spherical surface 21a is a cutting edge 21c.
  • the partial spherical surface 21a is a flank.
  • the surface of the groove 21b connected to the cutting edge 21c is a rake surface.
  • FIG. 3 is a schematic plan view of the partial spherical surface 21a in the ball end mill 100.
  • FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG.
  • a plurality of first recesses 22 are formed in the partial spherical surface 21a.
  • the partial spherical surface 21a is recessed in the first recess 22.
  • the first concave portion 22 has a hexagonal shape in a plan view (viewed from a direction orthogonal to the partial spherical surface 21a), but the planar shape of the first concave portion 22 is limited to this. I can't.
  • the first recess 22 is formed, for example, over the entire surface of the partial spherical surface 21a.
  • the first recess 22 may be formed only in a part of the partial spherical surface 21a.
  • a protrusion 23 is formed on the partial spherical surface 21a.
  • the protrusion 23 is formed by contacting the ends of two adjacent first recesses 22. Since the protrusion 23 is formed by contacting the ends of two adjacent first recesses 22, the tip thereof is sharp (the tip does not include a flat surface).
  • the first recess 22 has a depth D1.
  • the depth D1 is the distance between the bottom of the first recess 22 and the tip of the protrusion 23.
  • the depth D1 is preferably 0.05 ⁇ m or more and 20 ⁇ m or less.
  • the arithmetic mean roughness (Ra) of the partial spherical surface 21a in the first recess 22 is preferably 0.05 ⁇ m or more and 1.5 ⁇ m or less.
  • the arithmetic mean roughness of the partial spherical surface 21a in the first recess 22 is measured according to the JIS standard (JIS B 0601: 2013).
  • the skewness (Ssk) of the partial spherical surface 21a in the portion where the first concave portion 22 and the protruding portion 23 are formed is preferably more than 0 (a positive value).
  • the skewness of the partial spherical surface 21a in the portion where the first concave portion 22 and the protruding portion 23 are formed is measured according to the JIS standard (JIS B 061-2: 2018).
  • FIG. 5 is a process diagram showing a manufacturing method of the ball end mill 100. As shown in FIG. 5, it has a preparation step S1, a joining step S2, and a first recess forming step S3.
  • the members constituting the main body portion 10 and the tip portion 20 are prepared.
  • the first concave portion 22 and the protruding portion 23 are not formed on the surface 21 (partial spherical surface 21a) of the tip portion 20 prepared in the preparation step S1.
  • the joining step S2 for example, the main body portion 10 and the tip portion 20 are joined by brazing.
  • the first recess 22 is formed.
  • the first recess 22 is formed by irradiating the surface 21 (partial spherical surface 21a) with a laser. Since the protrusion 23 is formed by the ends of two adjacent first recesses 22 contacting each other, the protrusion 23 is also formed by forming the first recess 22 in the first recess forming step S3. ..
  • the coolant collects in the first recess 22 (the first recess 22 becomes an oil pool), so that the cutting resistance between the flank (partial spherical surface 21a) and the work.
  • the cooling effect of the coolant increases as the amount of coolant decreases. As a result, the durability of the ball end mill 100 is improved.
  • the cutting edge 21c not only cuts the work, but also the protruding portion 23 grinds the work, so that the machined surface (specifically, the work quality) is processed. Surface roughness of the work surface) is improved. As described above, according to the ball end mill 100, the processing accuracy for the work can be improved.
  • the protruding portion 23 becomes sharper, so that the processed quality of the surface to be machined is improved. Further, the larger the depth D1, the more easily the coolant accumulates in the first recess 22. On the other hand, the larger the depth D1, the easier it is for the protrusion 23 to break. Therefore, by setting the depth D1 to 0.05 ⁇ m or more and 20 ⁇ m or less, the processing accuracy for the work and the durability of the ball end mill 100 can be further improved.
  • the configuration of the tool according to the second embodiment will be described below.
  • the tool according to the second embodiment is a machining tool for machining a work. More specifically, the tool according to the second embodiment is a ball end mill 200.
  • the points different from the configuration of the ball end mill 100 will be mainly described, and the overlapping description will not be repeated.
  • the ball end mill 200 has a main body portion 10 and a tip portion 20.
  • the main body 10 has a shank 11 and a neck 12.
  • the tip portion 20 has a surface 21.
  • the surface 21 includes a partial spherical surface 21a.
  • the first concave portion 22 and the protruding portion 23 are formed on the partial spherical surface 21a.
  • the configuration of the ball end mill 200 is common to the configuration of the ball end mill 100.
  • FIG. 6 is an enlarged side view of the vicinity of the tip portion 20 of the ball end mill 200.
  • the groove 21b and the cutting edge 21c are not formed on the surface 21. That is, in the ball end mill 200, the surface 21 is composed of a partial spherical surface 21a.
  • FIG. 7 is a schematic plan view of the partial spherical surface 21a in the ball end mill 200.
  • FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG.
  • a second concave portion 24 is further formed on the partial spherical surface 21a.
  • the configuration of the ball end mill 200 is different from the configuration of the ball end mill 100.
  • the second recess 24 is a recess different from the first recess 22.
  • the partial spherical surface 21a is recessed.
  • the second recess 24 is formed in, for example, the first recess 22.
  • the depth of the second recess 24 is defined as the depth D2.
  • the depth D2 is 1 ⁇ m or more.
  • the depth D2 is, for example, 20 ⁇ m or less.
  • the equivalent circle diameter of the second recess 24 in a plan view is preferably 0.5 ⁇ m or more and 50 ⁇ m or less.
  • the equivalent circle diameter of the second recess 24 in the plan view is the square root of the value obtained by dividing the area of the second recess 24 in the plan view by ⁇ / 4.
  • the area ratio of the second recess 24 on the surface 21 is preferably 3% or more and 80% or less.
  • the area ratio of the second recess 24 on the surface 21 is a value obtained by dividing the area of the surface 21 on which the second recess 24 is formed by the area of the surface 21 on which the first recess 22 and the protrusion 23 are formed.
  • the manufacturing method of the ball end mill 200 will be described below. Here, the points different from the manufacturing method of the ball end mill 100 will be mainly described, and duplicate explanations will not be repeated.
  • FIG. 9 is a process diagram showing a manufacturing method of the ball end mill 200.
  • the manufacturing method of the ball end mill 200 includes a preparation step S1, a joining step S2, and a first recess forming step S3.
  • the manufacturing method of the ball end mill 200 is different from the manufacturing method of the ball end mill 100.
  • the method for manufacturing the ball end mill 200 further includes a second recess forming step S4.
  • the manufacturing method of the ball end mill 200 is different from the manufacturing method of the ball end mill 100.
  • the second recess 24 is formed.
  • the second recess 24 is formed, for example, by irradiating the surface 21 (partial spherical surface 21a) with a laser.
  • the ball end mill 200 does not have a cutting edge 21c.
  • the second recess 24 acts as a fine cutting edge.
  • the first recess 22 also acts as a cutting edge.
  • the depth (depth D2) of the second recess 24 is less than 1 ⁇ m, the second recess 24 is unlikely to act as a cutting edge.
  • the depth D2 is less than 1 ⁇ m, chips generated from the work are clogged in the second recess 24, which tends to be the starting point of welding. As a result, wear of the surface 21 (partial spherical surface 21a) tends to proceed.
  • the work can be machined while ensuring the durability of the tool.
  • the equivalent circle diameter of the second recess 24 in a plan view is excessive, the second recess 24 is less likely to act as a cutting edge. Further, if the diameter corresponding to the circle of the second recess 24 in a plan view is too small, the second recess 24 is likely to be clogged with chips. Therefore, by setting the equivalent circle diameter of the second recess 24 in a plan view to 0.5 ⁇ m or more and 50 ⁇ m or less, the work can be machined while further improving the durability of the tool.
  • the area ratio of the second recess 24 is too small, the number of the second recess 24 that functions as a cutting edge is small. Further, if the area ratio of the second recess 24 is excessive, the ratio of the second recess 24 that functions as a cutting edge decreases, and the load per cutting edge (second recess 24) increases, so that the surface 21 Wear of (partial spherical surface 21a) is likely to progress. Therefore, by setting the area ratio of the second recess 24 to 3% or more and 80% or less, it is possible to process the work while further improving the durability of the tool.
  • the ball end mill 200 does not have the groove 21b and the cutting edge 21c, but the ball end mill 200 may have the groove 21b and the cutting edge 21c.
  • the configuration of the tool according to the third embodiment will be described below.
  • the tool according to the third embodiment is a cutting tool for cutting a work. More specifically, the tool according to the third embodiment is a cutting insert 300.
  • FIG. 10 is a perspective view of the cutting insert 300.
  • FIG. 11 is a cross-sectional view of the tip portion 20 of the cutting insert 300. As shown in FIGS. 10 and 11, the cutting insert 300 has a substrate 30 and a tip portion 20.
  • the substrate 30 has a first surface 30a, a second surface 30b, and a side surface 30c.
  • the second surface 30b is the opposite surface of the first surface 30a.
  • the side surface 30c is continuous with the first surface 30a and the second surface 30b.
  • the substrate 30 has a mounting portion 31.
  • the mounting portion 31 is located at a corner portion of the substrate 30 when viewed from a direction orthogonal to the first surface 30a.
  • the distance between the first surface 30a and the second surface 30b located on the mounting portion 31 is smaller than the distance between the first surface 30a and the second surface 30b located outside the mounting portion 31. That is, a step is formed in the mounting portion 31 on the first surface 30a side of the substrate 30.
  • the substrate 30 is formed of, for example, a cemented carbide.
  • the tip portion 20 is attached to the attachment portion 31 by brazing or the like.
  • the surface 21 of the tip portion 20 has a rake surface 21d, a flank surface 21e, and a cutting edge 21f.
  • the rake face 21d is connected to the flank surface 21e.
  • the rake face 21d is connected to the first surface 30a on the side opposite to the flank surface 21e.
  • the flank 21e is connected to the side surface 30c on the opposite side of the rake surface 21d.
  • the cutting edge 21f is formed on the ridgeline between the rake surface 21d and the flank surface 21e.
  • the rake face 21d has a first portion 21da and a second portion 21db.
  • the first portion 21da is a portion of the rake face 21d connected to the flank surface 21e.
  • the second portion 21db is a portion sandwiching the first portion 21da with the cutting edge 21f.
  • the first portion 21da is inclined with respect to the second portion 21db so as to form a negative angle with respect to the second portion 21db.
  • the first portion 21da has a negative angle with respect to the second portion 21db
  • the first portion is when the second portion 21db faces upward and the flank 21e faces to the left.
  • 21da is rotated counterclockwise with respect to the second portion 21db. From another point of view, the first part 21da is a negative land.
  • the first concave portion 22 and the protruding portion 23 are formed on the rake surface 21d and the flank surface 21e. More specifically, the first recess 22 and the protrusion 23 are formed on the first portion 21da and the flank 21e. A second recess 24 may be further formed on the rake face 21d (first portion 21da) and the flank 21e.
  • FIG. 12 is a process diagram showing a method of manufacturing the cutting insert 300.
  • the method for manufacturing the cutting insert 300 includes a preparation step S1, a joining step S2, a surface forming step S5, and a first recess forming step S3.
  • the method for manufacturing the cutting insert 300 may further include a second recess forming step S4.
  • the members constituting the substrate 30 and the tip portion 20 are prepared.
  • the first concave portion 22 and the protruding portion 23 are not formed on the surface 21 of the tip portion 20 prepared in the preparation step S1.
  • the joining step S2 for example, the substrate 30 and the tip portion 20 are joined by brazing.
  • the rake surface 21d and the flank surface 21e are formed on the surface 21.
  • the formation of the rake face 21d and the formation of the flank surface 21e are performed, for example, by irradiating the surface 21 with a laser.
  • the cutting edge 21f is also formed. Since the first recess forming step S3 and the second recess forming step S4 are as described above, the description thereof will be omitted here.
  • the coolant collects in the first recess 22 (the first recess 22 becomes an oil pool), so that the cutting resistance between the surface 21 and the work decreases and the coolant The cooling effect is enhanced. As a result, the durability of the cutting insert 300 is improved.
  • the cutting edge 21f not only cuts the work, but also the protrusion 23 formed on the flank surface 21e grinds the work, so that the machined surface is machined. Quality (surface roughness of the surface to be machined) is improved. As described above, according to the cutting insert 300, it is possible to improve the processing accuracy for the work.
  • samples 1 to 9 were used as the cutting insert 300. As shown in Table 1, the depth D1 was changed in Samples 1 to 9. Further, in Samples 1 to 9, the skewness of the surface 21 (first portion 21da and flank 21e) in the portion where the first concave portion 22 and the protruding portion 23 are formed was changed. In Samples 1 to 9, the arithmetic mean roughness of the partial spherical surface 21a in the first recess 22 was set to 0.15 ⁇ m.
  • samples 1 to 9 were used to turn a round bar-shaped work made of titanium-6 aluminum-4 vanadium alloy.
  • the first cutting test was performed under the conditions of a cutting speed of 250 m / min, a feed amount of 0.2 mm / rotation, and a depth of cut of 0.5 mm.
  • the coolant was supplied at a pressure of 7 MPa.
  • Table 2 shows the results of the first cutting test. As shown in Table 2, the tool life of Samples 1 to 6 exceeded the tool life of Samples 7 and 8.
  • the depth D1 was in the range of 0.05 ⁇ m or more and 20 ⁇ m or less, while in Samples 7 and 8, the depth D1 was not in the range of 0.05 ⁇ m or more and 20 ⁇ m or less. From this comparison, it was experimentally clarified that the durability of the cutting insert 300 can be improved by setting the depth D1 to 0.05 ⁇ m or more and 20 ⁇ m or less.
  • the durability of the cutting insert 300 can be further improved by setting the skewness of the surface 21 at the portion where the first recess 22 and the protrusion 23 are formed to a positive value. Revealed in.
  • ⁇ Second cutting test> A second cutting test was performed to confirm the effect of the arithmetic mean roughness of the surface 21 (first portion 21da and flank 21e) on the first recess 22. The second cutting test will be described below.
  • samples 10 to 14 were used as the cutting insert 300.
  • the arithmetic mean roughness of the surface 21 in the first recess 22 was changed, as shown in Table 3.
  • the depth D1 was set to 15 ⁇ m, and the skewness of the surface 21 at the portion where the first concave portion 22 and the protruding portion 23 were formed was set to a positive value.
  • the machining conditions of the second cutting test were the same as the machining conditions of the first cutting test.
  • the durability (tool life) of the samples 10 to 14 was evaluated by the time until the wear on the flank 21e became 150 ⁇ m.
  • Table 4 shows the results of the second cutting test. As shown in Table 4, the tool life of the samples 10 to 13 exceeded the tool life of the sample 14.
  • the arithmetic mean roughness of the partial spherical surface 21a in the first recess 22 of the samples 10 to 13 was in the range of 0.05 ⁇ m or more and 1.5 ⁇ m or less.
  • the arithmetic mean roughness of the partial spherical surface 21a in the first recess 22 of the sample 14 was not within the range of 0.05 ⁇ m or more and 1.5 ⁇ m or less.
  • the durability of the cutting insert 300 can be improved by setting the arithmetic mean roughness of the partial spherical surface 21a in the first recess 22 to 0.05 ⁇ m or more and 1.5 ⁇ m or less. ..
  • ⁇ Third cutting test> A third cutting test was performed to confirm the influence of the depth of the second recess 24 (depth D2), the equivalent circle diameter of the second recess 24 and the area ratio of the second recess 24 in a plan view. The third cutting test will be described below.
  • samples 15 to 25 were used as the cutting insert 300.
  • the depth D2 the equivalent circle diameter of the second recess 24 in plan view, and the area ratio of the second recess 24 were changed.
  • the depth D1 is set to 15 ⁇ m
  • the skewness of the surface 21 at the portion where the first concave portion 22 and the protruding portion 23 are formed is set to a positive value
  • the surface 21 in the first concave portion 22 is set.
  • the arithmetic mean roughness of was 0.15 ⁇ m.
  • the machining conditions of the third cutting test were the same as the machining conditions of the first cutting test.
  • the durability (tool life) of the samples 15 to 25 was evaluated by the time until the wear on the flank 21e became 150 ⁇ m.
  • the results of the third cutting test are shown in Table 6.
  • the tool life of samples 15 to 20 exceeded the tool life of sample 21.
  • the depth D2 of the samples 15 to 20 was within the range of 1 ⁇ m or more.
  • the depth D2 of sample 21 was not within the range of 1 ⁇ m or more. From this comparison, it was experimentally clarified that the tool life of the cutting insert 300 is improved by setting the depth D2 to 1 ⁇ m or more.
  • the tool life of samples 15 to 20 exceeded the tool life of samples 22 and 23.
  • the equivalent circle diameter of the second recess 24 of the samples 15 to 20 was within the range of 0.5 ⁇ m or more and 50 ⁇ m or less.
  • the equivalent circle diameters of the second recesses 24 of the sample 22 and the sample 23 were not within the range of 0.5 ⁇ m or more and 50 ⁇ m or less. From this comparison, it was experimentally clarified that the tool life of the cutting insert 300 is improved by setting the equivalent circle diameter of the second recess 24 in a plan view to 0.5 ⁇ m or more and 50 ⁇ m or less.
  • the tool life of samples 15 to 20 exceeded the tool life of samples 24 and 25.
  • the area ratio of the second recess 24 on the surface 21 of the samples 15 to 20 was within the range of 3% or more and 80% or less.
  • the area ratio of the second recess 24 on the surface 21 of the sample 22 and the sample 23 was not within the range of 3% or more and 80% or less. From this comparison, it was experimentally clarified that the tool life of the cutting insert 300 is improved by setting the area ratio of the second recess 24 on the surface 21 to 3% or more and 80% or less.
  • FIG. 13 is a side view of the radius end mill 400.
  • the contents of the third embodiment described above can be applied to, for example, a radius end mill 400 as shown in FIG. More specifically, the first concave portion 22 and the protruding portion 23 are formed on the flank surface and the rake surface formed on the tip portion 20 of the radius end mill 400.
  • the configuration of the tool according to the fourth embodiment will be described below.
  • the tool according to the fourth embodiment is a measuring tool for measuring the surface roughness or shape of the work. More specifically, the tool according to the fourth embodiment is a stylus 500.
  • FIG. 14 is a side view of the stylus 500.
  • the stylus 500 has a tip 20.
  • the stylus 500 is scanned on the work so that the surface 21 is in contact with the surface of the work. As a result, the surface roughness or shape of the work is measured.
  • a first recess 22 and a protrusion 23 are formed on the surface 21.
  • a second recess 24 may be further formed on the surface 21.
  • the stylus 500 Since the first recess 22 and the protrusion 23 are formed on the surface 21, the contact resistance between the surface of the work and the surface 21 when scanning the stylus 500 can be reduced.
  • 10 Main body, 10a 1st end, 10b 2nd end, 11 shank, 11a 1st end, 11b 2nd end, 12 neck, 12a 1st end, 12b 2nd end, 13 connection layer, 20 tip, 21 surface , 21a partial spherical surface, 21b groove, 21c cutting edge, 21d rake surface, 21da first part, 21db second part, 21e flank surface, 21f cutting edge, 22 first recess, 23 protrusion, 24 second recess, 30 substrate , 30a 1st surface, 30b 2nd surface, 30c side surface, 31 mounting part, 100 ball end mill, 200 ball end mill, 300 cutting insert, 400 radius end mill, 500 stylus, A rotation axis, D1, D2 depth, R diameter, S1 preparation step, S2 joining step, S3 first recess forming step, S4 second recess forming step, S5 surface forming step.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

L'outil de l'invention est équipé d'une partie extrémité avant formée par des grains de nitrure de bore cubique sans liant. La partie extrémité avant possède une surface en contact avec une pièce. Au moins une partie de cette surface contient une pluralité de premières parties retrait, et des parties saillie formées par contact mutuel des extrémités de deux desdites premières parties retrait adjacentes.
PCT/JP2020/024462 2020-06-22 2020-06-22 Outil, et procédé de fabrication de celui-ci WO2021260778A1 (fr)

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TW110122547A TW202206207A (zh) 2020-06-22 2021-06-21 工具及工具之製造方法

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JP2013212572A (ja) * 2012-03-07 2013-10-17 Toyota Central R&D Labs Inc 切削工具、その製造方法および切削品の製造方法
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